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Income Taxes (Schedule Of Effective Tax Rate) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Statutory U.S. federal income tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
State income tax, net of related federal income tax benefit	6.30%	4.30%	6.30%	4.30%
Foreign operations	0.80%	0.70%	0.80%	0.70%
Federal credits	(1.80%)	(1.10%)	(1.80%)	(1.10%)
Executive compensation disallowed	2.10%	0.10%	2.10%	0.10%
Meals and entertainment	1.60%	0.00%	1.60%	0.00%
Other	2.70%	(0.20%)	0.50%	(0.20%)
Discrete items	0.60%	(0.70%)	4.90%	(0.80%)
Effective income tax rate	33.30%	38.10%	35.40%	38.00%

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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